<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 消息提示区域 -->
    <el-alert
      title="添加商品信息"
      type="info"
      show-icon
      :closable="false"
      center
    >
    </el-alert>

    <!-- 步骤条区域 -->
    <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
      <el-step title="基本信息"></el-step>
      <el-step title="商品参数"></el-step>
      <el-step title="商品属性"></el-step>
      <el-step title="商品图片"></el-step>
      <el-step title="商品内容"></el-step>
      <el-step title="完成"></el-step>
    </el-steps>

    <!-- tab栏区域 -->
    <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
    <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click	="handleTabClick">
      <el-tab-pane label="基本信息" name="0">
        <el-form-item label="商品名称" prop="goods_name">
          <el-input v-model="addForm.goods_name"></el-input>
        </el-form-item>
         <el-form-item label="商品价格" prop="goods_price">
          <el-input v-model="addForm.goods_price" type="number"></el-input>
        </el-form-item>
         <el-form-item label="商品重量" prop="goods_weight">
          <el-input v-model="addForm.goods_weight" type="number"></el-input>
        </el-form-item>
         <el-form-item label="商品数量" prop="goods_number">
          <el-input v-model="addForm.goods_number" type="number"></el-input>
        </el-form-item>
         <el-form-item label="商品分类" prop="goods_cat">
           <el-cascader
    v-model="addForm.goods_cat"
    :options="catelist"
    expand-trigger= "hover"
    :props="cateProps"
    @change="handleChange"></el-cascader>
        </el-form-item>
      </el-tab-pane>
      <el-tab-pane label="商品参数" name="1">
        <el-form-item :label="item.attr_name" :key="item.attr_id" v-for="item in manyTableData">
          <!-- 多选框的结构书写 -->
          <el-checkbox-group v-model="item.attr_vals">
    <el-checkbox border :label="k" :key="i" v-for="(k,i) in item.attr_vals"></el-checkbox>
    
  </el-checkbox-group>
        </el-form-item>
      </el-tab-pane>
      <el-tab-pane label="商品属性" name="2">
        <el-form-item label="item.attr_name" :key="item.attr_id" v-for="item in onlyTableData">
          <el-input v-model="item.attr_vals"></el-input>
        </el-form-item>
      </el-tab-pane>
      <el-tab-pane label="商品图片" name="3">
        <el-upload
:headers="headerObj"
  :action="imageUrl"
  :on-preview="handlePreview"
  :on-remove="handleRemove"
  :on-success="handleSuccess"
  list-type="picture">
  <el-button size="small" type="primary">点击上传</el-button>
</el-upload>
      </el-tab-pane>
      <el-tab-pane label="商品内容" name="4">
        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
        <el-button type="primary" class="addBtn" @click="add">添加</el-button>
      </el-tab-pane>
    </el-tabs>
    </el-form>
    <!-- 预览图片的对话框 -->
    <el-dialog
  title="预览图片"
  :visible.sync="previewVisible"
  width="50%">
  <img :src="image" alt="" style="width: 100%">
</el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data() {
    return {
      //步骤条默认选中
      activeIndex: '0',
      //添加表单的对象
      addForm: {
        goods_cat: [],
        pics: [],
        //商品的参数，包括静态参数和动态参数
        attrs: []
      },
      //添加表单的验证对象
      addFormRules: {
        goods_name: [
          {required: true, message: '请输入商品名称', trigger: 'blur'}
        ],
         goods_price: [
          {required: true, message: '请输入商品价格', trigger: 'blur'}
        ],
         goods_weight: [
          {required: true, message: '请输入商品重量', trigger: 'blur'}
        ],
         goods_number: [
          {required: true, message: '请输入商品数量', trigger: 'blur'}
        ],
         goods_cat: [
          {required: true, message: '请选择商品分类', trigger: 'blur'}
        ]

      },
      //商品分类数据
      catelist: [],
      //级联选择器的配置
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      //动态参数数据
      manyTableData: [],
      //静态属性列表数据
      onlyTableData: [],
      //上传图片的路径
      imageUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
      //上传图片的请求头
      headerObj: {Authorization: window.sessionStorage.getItem('token')},
      //预览图片的url地址
      image: '',
      //控制预览图片的对话框
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  computed: {
    cateId() {
      if(this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },
  methods: {
    //获取商品分类的数据
    async getCateList() {
      const {data: res} = await this.$http.get('categories')
      if(res.meta.status == 200) {
        this.catelist = res.data
        this.$message.success('获取商品分类数据成功！')

      } 
    },
    //级联选择器内容发生变化时触发的事件
    handleChange() {
      if(this.addForm.goods_cat.length != 3) {
        this.addForm.goods_cat = []
      }
    },
    //当切换标签之前触发的事件
    beforeTabLeave(activeName,oldActiveName) {
      if(oldActiveName == '0' && this.addForm.goods_cat.length !==3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    //当点击tab标签页时触发的事件
    async handleTabClick() {
  
      if(this.activeIndex == 1) {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params: {sel: 'many'}
        })
        if(res.meta.status !== 200) {
          this.$message.error('获取动态参数失败！')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length!== 0 ? item.attr_vals.split(' ') : []
        })
        this.manyTableData = res.data
        console.log(this.manyTableData);
      }else if(this.activeIndex == 2) {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params: {sel: 'only'}
        })
        if(res.meta.status !== 200) {
          this.$message.error('获取静态参数失败！')
        }
        this.onlyTableData = res.data
      }
    },
    //预览图片触发的事件
    handlePreview(file) {
      console.log(file);
      this.image = file.response.data.url
      this.previewVisible = true

    },
    //移除图片时触发的事件
    handleRemove(file) {
      console.log(file);
      const filePath = file.response.data.tmp_path;
      const index = this.addForm.pics.findIndex(item => item.pic == filePath)
      this.addForm.pics.splice(index,1)
      console.log(this.addForm);
    },
    //上传图片成功触发的事件
    handleSuccess(response) {
      console.log(response);
      const picPath = {pic: response.data.tmp_path}
      console.log(this.addForm.pics instanceof Array);
      this.addForm.pics.push(picPath)
    },
    //点击添加按钮触发的事件
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) {
          return this.$message.error('请填写必要的表单项!')
        }
        //要把goods_cat改为以，分割的字符串
        //首先要使用lodash的一个方法cloneDeep进行深拷贝  然后对新对象进行处理
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        //把商品的参数（数组），包含 `动态参数` 和 `静态属性`
        this.manyTableData.forEach(item  => {
          const newInfo = {attr_id: item.attr_id,attr_value: item.attr_vals.join(',')}
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = {attr_id: item.attr_id,attr_value: item.attr_vals}
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs;
        //发起请求
        const {data: res} = await this.$http.post(`goods`,form)
        if(res.meta.status !== 201) {
          this.$message.error('添加商品失败！')
        }
        this.$message.success('添加成功！')
        this.$router.push('/goods')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0!important;
}
.addBtn {
  margin-top: 15px;
}
</style>